| // Copyright (C) 2015 The Android Open Source Project |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package transform |
| |
| import "android.googlesource.com/platform/tools/gpu/atom" |
| |
| // EarlyTerminator is an implementation of Transformer that will consume all |
| // atoms (except for the EOS atom) once all the atoms passed to Add have passed |
| // through the transformer. |
| type EarlyTerminator struct { |
| requests atom.IDSet |
| } |
| |
| // Add adds the atom with identifier id to the set of atoms that must be seen |
| // before the EarlyTerminator will consume all atoms (excluding the EOS atom). |
| func (t *EarlyTerminator) Add(id atom.ID) { |
| if t.requests == nil { |
| t.requests = make(atom.IDSet) |
| } |
| t.requests.Add(id) |
| } |
| |
| func (t *EarlyTerminator) Transform(id atom.ID, a atom.Atom, out atom.Writer) { |
| if len(t.requests) == 0 { |
| // Seen all the atoms we want, ignore remaining ones |
| return |
| } |
| out.Write(id, a) |
| t.requests.Remove(id) |
| } |
| |
| func (t *EarlyTerminator) Flush(out atom.Writer) {} |
